1. A STUDY ON HIGH PERFORMANCE CONCRETE WITH FLY ASH AND SILICA POWDER
S.KARTHICK PAANDIAN
G.ILAMPARITHI
K.KASI
D.MANOJ KUMAR
GUIDED BY: Ms.KARTHIYAINI M.E.,
Asst. Prof. (Sr. Grade)

2. OBJECTIVES
The main objective of this project is to compare the compressive strength of conventional concrete cubes with concrete cubes made by using fly ash and silica powder as a admixture.

3. MATERIALS USED Cement(43 grade) OPC. Fine aggregate.
Coarse aggregate of 12mm.
Water both for mixing as well as curing.
Silica powder
Fly Ash

4. SPECIFIC GRAVITY OF MATERIALS
Sp. Gravity Cement = 3.15
Coarse Aggregate (12mm) = 2.65
Fine Aggregate = 2.61
Silica powder = 2.5
Fly Ash = 2.19

5. FLY ASH
Fly ash is the mineral residue produced by burning coal that is captured from exhaust gases and collected for use.
Fly ash produces more cementitious paste. It has a lower unit weight
Fly ash reduces the amount of sand needed in the mix to produce workability

6. Advantages of fly ash
Reduces the water demand.
Greater resistance to sulphate attack
Minimizes cracking due to thermal and drying shrinkage
Long term mechanical properties (compressive,
flexural, abrasion strength) improved
Workability of fresh concrete is easily enhanced

7. Uses of fly ash
Partial replacement for ordinary portland cement (OPC)
Percentage of fly ash in total cementing materials, normally ranges from 15 to 25%
It can go up to 30-35% in some applications

8. SILICA POWDER
Silica powder is a natural stone form mineral that is grinded in crystalline form
Physical properties
Appearance: White Fine Powder
Sp. gravity: 2.5

9. Uses of silica powder
Plastics: Most preferred mineral in PVC chappal, PVC pipes and industrial products
Rubber: Widely used in high value rubber products industry. These are also used in distempers, emulsion paints, architectural finishes, flat paints traffic paints, industrial primer, undercoats, putties and finishes
Paints: Versatile application in paint convenient filler in paper manufacture
Also used in soft boards

10. MIX RATIO
Water: Cement: F.A.: C.A. = 0.4: 1: 1.65: 2.92

11. Aggregates
Aggregates are the materials basically used as filler with binding materials in the production of mortar & concrete.
TYPES OF AGGREGATES
Coarse Aggregate (grit)
Fine Aggregate (sand)

12. MIXING

13. CUBES

14. TESTING OF CUBES

15. TESTING OF CUBES

16. TESTING OF CUBES

17. COMPRESSIVE STRENGTH (7 DAYS) MPa
RESULTS OBTAINED SO FOR M40 GRADE
MIX
COMPRESSIVE STRENGTH (7 DAYS) MPa
Sample1
Sample2
Sample3
Average
CONTROL
29.08
27.24
28.51
28.27
SILICA POWDER 5%
28.71
28.53
27.72
28.32
SILICA POWDER 10%
26.46
25.53
25.19
25.72
SILICA POWDER 15%
24.31
25.73
23.01
24.35

19. RESULTS OBTAINED FOR M40 GRADE MIX
COMPRESSIVE STRENGTH
(7 DAYS) MPa
Sample1
Sample2
Sample3
Average
CONTROL
29.08
27.24
26.51
27.61
5% OF FLY ASH and SILICA
28.73
29.63
28.15
28.53
10%OF FLY ASH and SILICA
29.22
28.36
27.55
28.37
15%OF FLY ASH and SILICA
29.32
28.65
29.10
29.35

21. COMPRESSIVE STRENGTH (28 DAYS) MPa
RESULTS OBTAINED FOR M40 GRADE
MIX
COMPRESSIVE STRENGTH (28 DAYS) MPa
Sample1
Sample2
Sample3
Average
CONTROL
59.78
57.70
57.45
58.31
SILICA POWDER 5%
56.76
54.34
55.12
55.40
SILICA POWDER 10%
55.63
55.82
54.70
55.35
SILICA POWDER 15%
52.78
51.63
53.24
52.55

23. COMPRESSIVE STRENGTH (28 DAYS) MPa
RESULTS OBTAINED FOR M40 GRADE
MIX
COMPRESSIVE STRENGTH (28 DAYS) MPa
Sample1
Sample 2
Sample3
Average
CONTROL
59.78
57.70
57.45
58.31
5% OF FLY ASH and SILICA
58.26
58.93
57.41
58.20
10%OF FLY ASH and SILICA
57.92
58.16
56.28
15%OF FLY ASH and SILICA
57.38
57.85
58.49
57.90

25. CONCLUSION
In our study we have made samples of M40 grade concrete cubes of dimension 100 mm x 100 mm x 100mm ratio of mix design were 1:1.65:2.92 were designed according to the IS code method. A addition of 5%, 10%, 15% of silica and fly ash were added to the normal grade of concrete mix and above cubes are further casted. These cubes were tested for compression strength on 7 days and 28 days from the casting.

26. These compressive strength of the specimen were compared with one another and final output shows that there is slight reduction in compressive strength when it is added with silica and fly ash. These reduction may be due to addition of these admixtures. Hence these admixtures can be used as a replacement of Silica as a fine aggregates and Fly ash as a cement in the future works.
These results were concluded from our study.